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The host galaxy was hiding in clouds of leftover debris where new stars are born, explaining why some explosions seem to have "no home": their galaxies are just too dim to spot from Earth.
The neutron stars behind the blast were themselves born after a galactic smash-up millions of years ago.

When those neutron stars merged, they created and scattered gold, platinum, and other heavy elements into space.
That's how these precious materials end up even in the far reaches of galaxies — not just their bright centers.
This discovery helps scientists piece together where cosmic explosions happen and how the universe gets its bling.